A Welding Process for Unclear Root of X-shaped Groove of Medium and Heavy Plate

Abstract

A medium thickness plate X-shaped bevel welding technology without back chipping belongs to the technical field of welding, especially to the technical field of carbon steel, stainless steel medium thickness plate submerged arc welding. The submerged arc welding is used to weld without back chipping. The technology comprises the following steps: A pre-welding cutting and assembling; B front backing welding; C front low-current submerged arc welding; D back welding; E residue filling and cover welding. The technology method is suitable for welding weld seams of more than 10 mm, and is not sensitive to the differentiation change in the quality of bevels, the assembly clearance, the misalignment value and the surface roughness and suitable for the actual production. A lot of welding materials and electricity are saved, the back chipping and the welding time is shortened, the production cost is obviously saved, and the welding production efficiency is increased.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to the field of submerged arc welding of carbon steel and stainless steel plate. Background technique [0002] Butt welding of medium and thick plates is an important link in the manufacturing process of pressure vessels and steel structure products. The traditional welding method of this type of weld generally adopts a single V or X-shaped groove, and uses manual arc welding or gas shielded welding for backing , after submerged arc welding is performed on the front side, the root is cleaned on the back side, and then submerged arc welding is performed on the back side. This method of production requires a lot of manpower, carbon rods, and electric energy. The weld metal filling is large, and the production efficiency is low and time-consuming. , Consumption cost. [0003] The X-shaped groove is directly used for submerged arc welding, bottoming, filling, and covering, and blunt e...

AI Technical Summary

Problems solved by technology

[0002] Butt welding of medium and thick plates is an important link in the manufacturing process of pressure vessels and steel structure products. The traditional welding method of this type of weld generally adopts a single V or X-shaped groove, and uses manual arc welding or gas shielded welding for backing , after submerged arc welding is performed on the front side, the root is cleaned on the back side, and then submerged arc welding is performed on the back side. This method of production requires a lot of manpower, carbon rods, and electric energy. The weld metal filling is large, and the production efficiency is low and time-consuming. , cost

[0003] The X-shaped groove is directly used for submerged arc welding, bottoming, filling, and covering, and blunt edges need to be reserved, which increases the processing process of the groove, and has very strict requirements on the roughness, gap size, and blunt edge size of the workpiece groove. , is not easy to achieve

[0004] The single-sided Y-groove type belongs to asymmetric welding, the welding deformation is difficult to control and the weld metal filling amount is large, the production efficiency is low, time-consuming, cost-consuming, and the application range is limited.

[0005] The welding technology of I-type groove with unclear root is only widely used in welding steel plates less than 14mm, and the application range is limited

[0006] In addition, the above welding method is prone to misalignment of different sizes, and it is difficult to operate in the later welding process, which affects product quality

[0007] The prior art closest to the present invention is the X-shaped groove submerged arc welding process for medium and thick plates applied by Hunan Valin Xiangtan Iron and Steel Co., Ltd., and its patent number is "201010579763.8". Parameters, its welding current, welding voltage, welding speed; there is no bottom welding process in the welding process, if the relevant parameters of the above patents are used in actual production, there are problems such as easy welding leakage and difficult operation during welding.

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